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- /****************************************************************************
- * prism.h
- *
- * This module contains all defines, typedefs, and prototypes for PRISM.C.
- *
- * from Persistence of Vision(tm) Ray Tracer
- * Copyright 1996 Persistence of Vision Team
- *---------------------------------------------------------------------------
- * NOTICE: This source code file is provided so that users may experiment
- * with enhancements to POV-Ray and to port the software to platforms other
- * than those supported by the POV-Ray Team. There are strict rules under
- * which you are permitted to use this file. The rules are in the file
- * named POVLEGAL.DOC which should be distributed with this file. If
- * POVLEGAL.DOC is not available or for more info please contact the POV-Ray
- * Team Coordinator by leaving a message in CompuServe's Graphics Developer's
- * Forum. The latest version of POV-Ray may be found there as well.
- *
- * This program is based on the popular DKB raytracer version 2.12.
- * DKBTrace was originally written by David K. Buck.
- * DKBTrace Ver 2.0-2.12 were written by David K. Buck & Aaron A. Collins.
- *
- *****************************************************************************/
-
-
- #ifndef PRISM_H
- #define PRISM_H
-
-
-
- /*****************************************************************************
- * Global preprocessor definitions
- ******************************************************************************/
-
- #define PRISM_OBJECT (STURM_OK_OBJECT)
-
- #define LINEAR_SPLINE 1
- #define QUADRATIC_SPLINE 2
- #define CUBIC_SPLINE 3
-
- #define LINEAR_SWEEP 1
- #define CONIC_SWEEP 2
-
- /* Generate additional prism statistics. */
-
- #define PRISM_EXTRA_STATS 1
-
-
-
- /*****************************************************************************
- * Global typedefs
- ******************************************************************************/
-
- typedef struct Prism_Struct PRISM;
- typedef struct Prism_Spline_Struct PRISM_SPLINE;
- typedef struct Prism_Spline_Entry_Struct PRISM_SPLINE_ENTRY;
-
- struct Prism_Spline_Entry_Struct
- {
- DBL x1, y1, x2, y2; /* Min./Max. coordinates of segment */
- UV_VECT A, B, C, D; /* Coefficients of segment */
- };
-
- struct Prism_Spline_Struct
- {
- int References;
- PRISM_SPLINE_ENTRY *Entry;
- };
-
- struct Prism_Struct
- {
- OBJECT_FIELDS
- int Number;
- int Spline_Type; /* Spline type (linear, quadratic ...) */
- int Sweep_Type; /* Sweep type (linear, conic) */
- TRANSFORM *Trans;
- DBL Height1, Height2;
- DBL x1, y1, x2, y2; /* Overall bounding rectangle of spline curve */
- PRISM_SPLINE *Spline; /* Pointer to array of splines */
- };
-
-
-
- /*****************************************************************************
- * Global variables
- ******************************************************************************/
-
-
-
-
- /*****************************************************************************
- * Global functions
- ******************************************************************************/
-
- PRISM *Create_Prism PARAMS((void));
- void Compute_Prism_BBox PARAMS((PRISM *Prism));
- void Compute_Prism PARAMS((PRISM *Prism, UV_VECT *P));
-
-
-
- #endif
-